As the tap engages the hole it is cutting the thread geometry out of the material, therefore creating chips. When using cut taps in a blind hole, regardless of standard tap or bottoming tap, you need to make room for chips. This is due to the main problem with cut taps … CHIPS. These are used when there is a tighter tolerance on the depth of the hole, in situations where a hole too deep will break through into a feature. This allows you to engage the tap deeper into a blind hole. A bottoming tap has the lead almost completely ground off. However, if you are tapping a blind hole you would be wise to consider a bottoming tap. Threading a Blind Hole with a Bottoming Tap This bottoming tap has little or no lead and allows you to thread deeper into a blind hole. The larger the thread the longer the lead. When tapping a through hole you need to make sure you go deep enough to cut threads all the way through the hole – the length of the lead will depend on the size of the thread. The lead is the tapered portion on the end of the tap that essentially centers the tap in the hole when engaging. When tapping a through hole you can use a standard cut tap which has a lead on it. When determining which tap you need you should pay attention to the type of hole you are tapping. Creating Threads in Through Holes with a Cut Tap Standard tap for creating threads with a CNC milling machine. Cut taps can be used by hand, on a drill press with a tapping head, on a knee mill, or rigid tapping on a CNC machine. Pretty straight forward – drill the hole to the right size and depth, countersink the hole, then tap it. You have all seen the drill charts that give you the tap drill sizes required for different threads. Cut taps are reasonably cheap and very versatile. In my experience cut taps are the most widely used across most industries. I know, opinions are like… well, you get it, just stay with me and hopefully I can provide some insight.įirst and foremost we have cut taps. For now, we are going to give a general overview of cutting threads based on my experiences and opinions. For the most part I am going to discuss my experiences with the different types of thread cutting/forming, so if you are looking for tons of technical information I apologize, but there are so many variables when it comes to the threading –perhaps I can write a more technical blog on each type of thread forming. Hey folks, today we are going to talk about threading in multiple forms.
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